Accounting Policies [Abstract] Accounting Policies [Abstract] Accounts Payable, Current Accounts payable Accounts Receivable, Gross, Current Accounts receivable - billed Accounts Receivable [Member] Accounts Receivable [Member] Accounts Receivable, Net, Current Accounts receivable, net Accounts receivable, net Accounts receivable, net. Accounts Receivable Net [Text Block] Accounts Receivable, Net Accrued expenses and other current liabilities. Accrued Expenses And Other Current Liabilities Accrued expenses and other current liabilities Total accrued expenses and other current liabilities Accrued expenses and other current liabilities. Accrued Expenses And Other Current Liabilities [Member] Accrued Expenses and Other Current Liabilities [Member] Accrued Expenses And Other Current Liabilities Table [Text Block] Accrued Expenses And Other Current Liabilities Table [Text Block] Schedule of Accrued Expenses and Other Current Liabilities Accrued Expenses And Other Current Liabilities [Text Block] Accrued Expenses And Other Current Liabilities [Text Block] Accrued Expenses and Other Current Liabilities Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less accumulated depreciation Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Unrealized (loss) gain on short-term interest-bearing investments, net of tax Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Net unrealized (losses) gains on cash flow hedges, net of tax, end of period Net unrealized (losses) gains on cash flow hedges, net of tax, beginning of period Unrealized (loss) gain on derivatives, net of tax Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax Unrealized (loss) on defined benefit plan, net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive (loss) income Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive (Loss) Income Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Estimated Useful Life Acquisition related liabilities. Acquisition Related Liabilities Acquisition-related liabilities Actix [Member] Actix [Member] Actix [Member] Additional Paid in Capital Additional paid-in capital Additional Paid-in Capital [Member] Additional Paid-in Capital Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Tax benefit from equity-based awards Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Reconciliation of net income to net cash provided by operating activities: Aggregate Accounts Receivable Above Stated Percentage Of Accounts Receivables Aggregate Accounts Receivable Above Stated Percentage Of Accounts Receivables Aggregate account receivable of more than 10% of total accounts receivable Allocated Share-based Compensation Expense Allocated share-based compensation expense Allowance for Doubtful Accounts, Current [Member] Accounts Receivable Allowances [Member] Allowance for Doubtful Accounts Receivable, Current Less - allowances Amendment Flag Amendment Flag Amortization Of Definite - Lived Purchased Intangible Assets Amortization Of Definite Lived Purchased Intangible Assets Amortization of definite-lived purchased intangible assets Amortization of Intangible Assets Amortization of purchased intangible assets and other Amortization of intangible assets net. Amortization Of Intangible Assets Net Total Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted average number of shares attributable to antidilutive outstanding stock options not included in the calculation of diluted earnings per share April Two Thousand Fourteen Plan [Member] April Two Thousand Fourteen Plan [Member] April 2014 Plan [Member] Asset-backed Securities [Member] Asset Backed Obligations [Member] Assets Total assets Assets [Abstract] ASSETS Assets, Current Total current assets Assets, Current [Abstract] Current assets: Available-for-sale Securities Available-for-sale securities Fair Value Fair value, Measured on recurring basis, Investments Available-for-sale Securities [Abstract] Available-for-sale securities: Available-for-sale Securities, Amortized Cost Basis Amortized Cost Available for sale securities debt maturities after four years fair value. Available For Sale Securities Debt Maturities After Four Years Fair Value Thereafter This item represents the fair value of debt securities which are expected to mature after one year and through two years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. Available For Sale Securities Debt Maturities After One Through Two Years Fair Value 1 to 2 years Available for sale securities debt maturities after three through four years fair value. Available For Sale Securities Debt Maturities After Three Through Four Years Fair Value 3 to 4 years This item represents the fair value of debt securities which are expected to mature after two year and through three years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. Available For Sale Securities Debt Maturities After Two Through Three Years Fair Value 2 to 3 years Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Due within one year Available-for-sale Securities, Debt Securities Fair Value Available-for-sale Securities, Debt Securities, Current Short-term interest-bearing investments Available-for-sale Securities, Gross Realized Gain (Loss) Loss from short-term interest-bearing investments Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. Available For Sale Securities, Gross Unrealized Gain Accumulated In Investments Gross Unrealized Gains Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments. Available For Sale Securities Gross Unrealized Loss Accumulated In Investments Gross Unrealized Losses Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Building [Member] Office Space [Member] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition [Line Items] Business Acquisition [Line Items] Business Combination Disclosure [Text Block] Acquisitions Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Allowances for accounts receivable acquired Business Combinations [Abstract] Business Combinations [Abstract] Capitalized Computer Software, Net Unamortized software assets Cash And Cash Equivalent Maximum Maturity Period Cash And Cash Equivalent Maximum Maturity Period Cash and cash equivalents maximum maturity period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of year Cash and cash equivalents at beginning of year Cash and cash equivalents Cash and Cash Equivalents [Member] Cash and Cash Equivalents [Member] Cash and Cash Equivalents, Period Increase (Decrease) Net increase in cash and cash equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Foreign currency cash flow hedge, reclassified into earnings during fiscal year 2015 Cash paid for. Cash Paid For [Abstract] Cash paid for: Celcite [Member] Celcite [Member] Celcite [Member] Changes in net unrealized losses gains on cash flow hedges. Changes In Net Unrealized Losses Gains On Cash Flow Hedges Table [Text Block] Changes in Net Unrealized (Losses) Gains on Cash Flow Hedges Class of Treasury Stock [Table] Class of Treasury Stock [Table] Commercial paper and certificates of deposit. Commercial Paper And Certificates Of Deposit [Member] Commercial Paper and Certificates of Deposit [Member] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Text Block] Contingencies and Commitments Common Stock, Dividends, Per Share, Declared Cash dividends declared per ordinary share Dividends Per Ordinary Share Common Stock [Member] Ordinary Shares Common Stock, Par or Stated Value Per Share Ordinary Shares, par value Common Stock, Shares Authorized Ordinary Shares, authorized Common Stock, Shares, Issued Ordinary Shares, issued Common Stock, Shares, Outstanding Ending balance, Shares Beginning balance, Shares Ordinary Shares, outstanding Common Stock, Value, Issued Ordinary Shares - Authorized 700,000 shares; £0.01 par value; 264,735 and 259,668 issued and 156,704 and 160,062 outstanding, in 2014 and 2013, respectively Compensation and Retirement Disclosure [Abstract] Compensation and Retirement Disclosure [Abstract] Compensation Related Costs, Policy [Policy Text Block] Equity-Based Compensation Components of Deferred Tax Assets [Abstract] Deferred tax assets: Components of Deferred Tax Liabilities [Abstract] Deferred tax liabilities: Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Comprehensive income: Comprehensive Income, Policy [Policy Text Block] Comprehensive Income Computer Equipment [Member] Computer Equipment [Member] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentrations of Credit Risk Concentration Risk, Customer Concentration of credit risk, accounts receivable Concentration Risk, Percentage Percentage of concentration risk Concentration Risk Type [Domain] Concentration Risk Type [Domain] Consolidation, Policy [Policy Text Block] Consolidation Core technology. Core Technology [Member] Core Technology [Member] Corporate Debt Securities [Member] Corporate Bonds [Member] Cost of Sales [Member] Cost of Service [Member] Cost of Sales, Policy [Policy Text Block] Cost of License and Cost of Service Cost of Services Cost of service Cost of Services, Amortization Cost of service Current Fiscal Year End Date Current Fiscal Year End Date Current Income Tax Expense (Benefit) Current Customer Concentration Risk [Member] Customer Concentration Risk [Member] Customer Experience Solutions [Member] Customer Experience Solutions [Member] Customer Experience Solutions [Member] Customer one. Customer One [Member] Customer 1 [Member] Customer Relationships [Member] Customer Relationships [Member] Customer two. Customer Two [Member] Customer 2 [Member] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Text Block] Financing Arrangements Debt Instrument, Interest Rate, Stated Percentage Interest rate on convertible senior notes Debt Instrument, Term Revolving credit facility, maturity term Deferred Costs, Noncurrent Deferred costs Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred Income Taxes and Other Tax Liabilities, Noncurrent Deferred income taxes and taxes payable Deferred Income Taxes and Other Tax Receivable, Current Deferred income taxes and taxes receivable Deferred income taxes and taxes payable includes the current portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A current taxable temporary difference is a difference between the tax basis and the carrying amount of a current asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carry forwards, shall be classified according to the expected reversal date of the temporary difference. In addition, it also includes the carrying value as of the balance sheet date of obligations incurred and payable for statutory income taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Deferred Income Taxes And Taxes Payable Deferred income taxes and taxes payable Deferred Income Tax Expense (Benefit) Deferred Deferred income taxes Deferred Revenue, Current Deferred revenue Deferred Revenue, Noncurrent Noncurrent deferred revenue Deferred tax assets deductible tax credits net capital and operating loss carryforwards. Deferred Tax Assets Deductible Tax Credits Net Capital And Operating Loss Carryforwards Tax credits, net capital and operating loss carryforwards Deferred Tax Assets, Deferred Income Deferred revenue Deferred Tax Assets, Gross Total deferred tax assets Deferred tax assets intangible assets, computer software and intellectual property. Deferred Tax Assets Intangible Assets Computer Software And Intellectual Property Intangible assets, computer software and intellectual property Deferred Tax Assets, Net Net deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Total deferred tax assets, net Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Deferred income taxes Deferred Tax Assets, Other Other Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Employee compensation and benefits Deferred Tax Assets, Valuation Allowance Valuation allowances Valuation allowances on deferred tax assets written off against the deferred tax assets. Deferred Tax Assets Valuation Allowance Written Off Valuation allowances on deferred tax assets written off against the deferred tax assets Deferred Tax Liabilities, Net Total deferred tax liabilities Deferred Tax Liabilities, Intangible Assets Intangible assets, computer software and intellectual property Deferred Tax Liabilities, Other Other Deferred Tax Liabilities, Undistributed Foreign Earnings Anticipated withholdings on subsidiaries' earnings Defined Benefit Pension Plan, Liabilities, Noncurrent Accrued pension liability Depreciation Depreciation expense Depreciation, Depletion and Amortization Depreciation and amortization Derivative Contract [Domain] Derivative Contract [Domain] Derivative Asset, Fair Value, Amount Not Offset Against Collateral Derivative Asset Derivative Liability, Fair Value, Amount Not Offset Against Collateral Derivative Liability Derivative, Fair Value, Net Derivative financial instruments, net Net fair value Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative instruments. Derivative Instruments Derivative instruments Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Financial Instruments Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Derivative, Notional Amount Foreign exchange contracts Derivative, Remaining Maturity Maximum maturity period of significant portion of forward and option contracts outstanding Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Derivatives, Policy [Policy Text Block] Derivatives and Hedging Description of maturity period of other risk management derivatives. Description Of Maturity Period Of Other Risk Management Derivatives Typical maturity period of other risk management derivatives Designated as Hedging Instrument [Member] Derivatives Designated as Hedging Instruments [Member] Directory [Member] Directory [Member] Directory [Member] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock Option and Incentive Plan Disclosure Of Dividends Declared And Paid [Text Block] Disclosure Of Dividends Declared And Paid [Text Block] Dividends Dividend Declaration Date April Thirty Two Thousand Fourteen [Member] Dividend Declaration Date April Thirty Two Thousand Fourteen [Member] Declaration Date, April 30, 2014 [Member] Dividend Declaration Date April Thirty Two Thousand Thirteen [Member] Dividend Declaration Date April Thirty Two Thousand Thirteen [Member] Declaration Date, April 30, 2013 [Member] Dividend Declaration Date August One Two Thousand Twelve [Member] Dividend Declaration Date August One Two Thousand Twelve [Member] Declaration Date, August 1, 2012 [Member] Dividend Declaration Date January Thirty Two Thousand Thirteen [Member] Dividend Declaration Date January Thirty Two Thousand Thirteen [Member] Declaration Date, January 30, 2013 [Member] Dividend Declaration Date January Twenty Nine Two Thousand Fourteen [Member] Dividend Declaration Date January Twenty Nine Two Thousand Fourteen [Member] Declaration Date, January 29, 2014 [Member] Dividend Declaration Date July Thirty One Two Thousand Thirteen [Member] Dividend Declaration Date July Thirty One Two Thousand Thirteen [Member] Declaration Date, July 31, 2013 [Member] Dividend Declaration Date July Twenty Nine Two Thousand Fourteen [Member] Dividend Declaration Date July Twenty Nine Two Thousand Fourteen [Member] Declaration Date, July 29, 2014 [Member] Dividend Declaration Date November Five Two Thousand Thirteen [Member] Dividend Declaration Date November Five Two Thousand Thirteen [Member] Declaration Date, November 5, 2013 [Member] Dividend Declaration Date November Six Two Thousand Twelve [Member] Dividend Declaration Date November Six Two Thousand Twelve [Member] Declaration Date, November 6, 2012 [Member] Dividends Payable, Date to be Paid Cash dividend payable date Payment Date Dividends [Axis] Dividends [Axis] Dividends, Common Stock, Cash Cash dividends declared Dividends Declared [Table Text Block] Summary of Dividends Declared by Board of directors Dividends [Domain] Dividends [Domain] Dividends Payable, Amount Per Share Quarterly dividend payment per share Dividends Payable, Current Dividend payable Dividends Payable Total Amount Dividends Payable, Date Declared Declaration Date Dividends payable date declared Dividends Payable, Date of Record Record Date Dividends Payable [Line Items] Dividends Payable [Line Items] Dividends Payable [Table] Dividends Payable [Table] Document And Entity Information Abstract. Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Period End Date Document Period End Date Document Type Document Type Earnings Per Share [Abstract] Earnings Per Share [Abstract] Earnings Per Share, Basic Basic earnings per share Earnings Per Share, Diluted Diluted earnings per share Earnings Per Share, Policy [Policy Text Block] Earnings per Share Earnings Per Share [Text Block] Earnings Per Share Effective Income Tax Rate Reconciliation, Percent Effective income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Corporate tax rate of the company Statutory Guernsey tax rate Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Foreign taxes (percentage) Effect of cash flow hedging instruments. Effect Of Cash Flow Hedging Instruments Table [Text Block] Effect of Cash Flow Hedging Instruments Effect of non designated as hedging instruments. Effect Of Non Designated As Hedging Instruments Table [Text Block] Effect of Non-Designated as Hedging Instruments